Dielectric reflectarray antennas are studied in this paper as a possible low-loss and low-cost solution for high gain THz antennas. Variable height dielectric slabs are proposed for the reflectarray elements which allow for the use of low dielectric-constant materials for the design. A 3-D printing technology is utilized to fabricate the antenna, and both
numerical and experimental results are presented for a prototype
operating at 100 GHz. This study shows that the proposed design
approach is well suited for high gain THz antennas.

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